code: def output_image_name(idx):
      return "outputimage%d" % idx
  
file_path: CellProfiler/tests/frontend/modules/test_unmixcolors.py
imports: import numpy
  import six.moves
  import cellprofiler_core.image
  import cellprofiler_core.measurement
  import cellprofiler.modules.unmixcolors
  import cellprofiler_core.object
  import cellprofiler_core.pipeline
  import cellprofiler_core.workspace
  import tests.frontend.modules
label_desc: Use image node_id 1 for calling a global function with example usage: output_image_name(idx) and returns: unknown